I’ve found both of those before, the second one quotes it as “Herr Holtermann proudly predicted” so that doesn’t work.
The first one based on Google Books is an unattributed chapter title, and searching doesn’t find any German words for slogan or motto in it. And Rudolf Olden is prominent enough that I think someone would have cited it by now if he had a KPD attribution in there.
I’ve found both of those before, the second one quotes it as “Herr Holtermann proudly predicted” so that doesn’t work.
The first one based on Google Books is an unattributed chapter title, and searching doesn’t find any German words for slogan or motto in it. And Rudolf Olden is prominent enough that I think someone would have cited it by now if he had a KPD attribution in there.
“Find me someone who attributes it to the KPD in a contemporary document.”
[finds you a contemporary document]
“Well, he doesn’t academically cite his sources or literally call it a motto!”
Yeah, that’s about what I expected.